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Long-Lived Assets - Summary of Aggregate Amortization Related to Customer Contract Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Capitalized Contract Cost [Line Items] |  |  |
Total customer contract costs amortization | $ 17,190 | $ 20,779 | $ 23,381
Customer contract incentives |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Total customer contract costs amortization | 708 | 6,018 | 11,052
Capitalized costs |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Total customer contract costs amortization | 13,803 | 12,625 | 10,304
Capitalized commission fees |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Total customer contract costs amortization | $ 2,679 | $ 2,136 | $ 2,025

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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